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Petri Dish - 89 mm (3.5 in) - 20 pack

Large-size Petri dish, great for science fair projects.


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Item #: WPTI-400

Usually ships the next day.

Availability: In stock

Petri Dish - 101 mm (4 in) - 20 pack

Used by biologists to culture bacteria and other microbes, these plastic petri dishes provide the perfect home for "growing" your latest science experiment. Nurture a new bacteria for this year's science fair project, and follow in the steps of Dr. Alexander Fleming when he discovered Penicillin in 1929! Recommended for children ages 6 and up.

What's Included?
  • 20 Pack Petri Dishes that are 89 mm (3.5") in diameter
  • Color Changing Milk activity guide
How Does It Work?

Partially fill your Petri dishes with a perfect mixture of nutrients that provide food for microbe growth. Scientists often use hot agar mixed with salts, amino acids and other substances perfect for supporting the particular microbes they wish to study. When the mixture cools, place your tiny cells on top of the surface and watch them multiply. Don’t worry, they take some time to grow!

Customer Reviews

Worked Great Review by Terri

I ordered these in the past for a science party and they worked great for dispersing the food coloring in milk using a cotton swab dipped in dish soap. I also used them for jello for the party. This time, I ordered them for my son's double dipping science fair project along with the nutrient agar. They experiment went very well. Great value with many uses. (Posted on 5/24/14)

Good Product Review by Science Mom

I ordered these for a Science Fair project as well as a classroom fun activity during the Valentine's Day party. They are sturdy enough to withstand 20 kids doing their project. I was able to bring all the Petri dishes home afterward so they can be reused. (Posted on 2/13/14)

perfect for home or school Review by kathy wilmovsky

These petri dishes are perfect for showing either your own kids or a class full of students all the germs that are on commonly used items. They are a great size and the kids are amazed at how disgusting some things are to touch. When we added hand sanitizer to the center of some of the dishes, it really made a difference and inhibited the growth of the bateria. This was a great example as to why kids should clean and sanitize their hands! (Posted on 4/13/13)

Perfect Review by joyce

We used these for a science fair project. Perfect!
And they shipped extremely fast!!! (Posted on 3/28/13)

Petri dishes for all Review by jfierbaugh

Economical way for all the students to participate individually in the experiment. (Posted on 3/9/13)

Fun to fill with jello Review by Melissa Malone

I ordered these for my daughter's science themed birthday party and filled them with green jello. They looked just like the agar you would use in a biology lab. We also used them for the milk, food coloring, and soap experiement which the kids thought was super cool. (Posted on 1/23/13)

Great for Science themed parties! Review by Paula

I used these petri dishes to make "gummy brains and worms" for my sons science themed birthday party! I used green jello and gummy worms and bugs! The kids loved them! (Posted on 12/17/12)

Petri Dishes Review by Sheri

We ordered the Petri dish kit for my 5th grader's science project, Who Would You Rather Kiss, Your Mom or Your Dog?. It worked very well and was easy to use. We will definitely order something from your website next year.

(Posted on 10/24/12)

good price and nice size Review by jlee

these were perfect for our petri dish jello desserts for my daughter's Mad Science party. the kids loved them (w/ the added gummy worm) and there were a few kids who had to leave early so we put it in their goody bags to eat at home. (Posted on 9/14/12)

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